I'm using Maven 3.0.3, JUnit 4.8.1, and Jacoco 0.6.3.201306030806, and I am trying to create test coverage reports.
I have a project with unit tests only, but I can't get reports to run, I'm repeatedly getting the error: Skipping JaCoCo execution due to missing execution data file when I run:
mvn clean install -P test-coverage
Here is how my pom is configured:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.14.1</version>
<configuration>
<reuseForks>true</reuseForks>
<argLine>-Xmx2048m</argLine>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.14.1</version>
<configuration>
<reuseForks>true</reuseForks>
<argLine>-Xmx4096m -XX:MaxPermSize=512M ${itCoverageAgent}</argLine>
</configuration>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
</execution>
</executions>
</plugin>
...
<profile>
<id>test-coverage</id>
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.6.3.201306030806</version>
<configuration>
<destfile>${basedir}/target/coverage-reports/jacoco-unit.exec</destfile>
<datafile>${basedir}/target/coverage-reports/jacoco-unit.exec</datafile>
</configuration>
<executions>
<execution>
<id>prepare-unit-tests</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<!-- prepare agent for measuring integration tests -->
<execution>
<id>prepare-integration-tests</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<phase>pre-integration-test</phase>
<configuration>
<propertyName>itCoverageAgent</propertyName>
</configuration>
</execution>
<execution>
<id>jacoco-site</id>
<phase>verify</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
All my tests run successfully. Here is some of the output from Maven:
[INFO] --- jacoco-maven-plugin:0.6.2.201302030002:prepare-agent (prepare-unit-tests) # myproject ---
[INFO] argLine set to -javaagent:/Users/davea/.m2/repository/org/jacoco/org.jacoco.agent/0.6.2.201302030002/org.jacoco.agent-0.6.2.201302030002-runtime.jar=destfile=/Users/davea/Dropbox/workspace/myproject/target/jacoco.exec
[INFO]
...
Tests run: 14, Failures: 0, Errors: 0, Skipped: 0
[INFO]
...
[INFO]
[INFO] --- jacoco-maven-plugin:0.6.2.201302030002:prepare-agent (prepare-integration-tests) # myproject ---
[INFO] itCoverageAgent set to -javaagent:/Users/davea/.m2/repository/org/jacoco/org.jacoco.agent/0.6.2.201302030002/org.jacoco.agent-0.6.2.201302030002-runtime.jar=destfile=/Users/davea/Dropbox/workspace/myproject/target/jacoco.exec
[INFO]
[INFO] --- maven-failsafe-plugin:2.14.1:integration-test (default) # myproject ---
[WARNING] File encoding has not been set, using platform encoding MacRoman, i.e. build is platform dependent!
[INFO]
[INFO] --- maven-failsafe-plugin:2.14.1:verify (default) # myproject ---
[INFO] Failsafe report directory: /Users/davea/Dropbox/workspace/myproject/target/failsafe-reports
[WARNING] File encoding has not been set, using platform encoding MacRoman, i.e. build is platform dependent!
[INFO]
[INFO] --- jacoco-maven-plugin:0.6.2.201302030002:report (jacoco-site) # myproject ---
[INFO] Skipping JaCoCo execution due to missing execution data file
[INFO]
Any ideas what configuration I'm missing?
jacoco-maven-plugin:0.7.10-SNAPSHOT
From jacoco:prepare-agent that says:
One of the ways to do this in case of maven-surefire-plugin - is to
use syntax for late property evaluation:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>#{argLine} -your -extra -arguments</argLine>
</configuration>
</plugin>
Note the #{argLine} that's added to -your -extra -arguments.
Thanks Slava Semushin for noticing the change and reporting in the comment.
jacoco-maven-plugin:0.7.2-SNAPSHOT
Following jacoco:prepare-agent that says:
[org.jacoco:jacoco-maven-plugin:0.7.2-SNAPSHOT:prepare-agent] Prepares a property pointing to the JaCoCo runtime agent that can be
passed as a VM argument to the application under test. Depending on
the project packaging type by default a property with the following
name is set:
tycho.testArgLine for packaging type eclipse-test-plugin and
argLine otherwise.
Note that these properties must not be overwritten by the
test configuration, otherwise the JaCoCo agent cannot be attached. If
you need custom parameters please append them. For example:
<argLine>${argLine} -your -extra -arguments</argLine>
Resulting
coverage information is collected during execution and by default
written to a file when the process terminates.
you should change the following line in maven-surefire-plugin plugin configuration from (note the ${argLine} inside <argLine>):
<argLine>-Xmx2048m</argLine>
to
<argLine>${argLine} -Xmx2048m</argLine>
Make also the necessary changes to the other plugin maven-failsafe-plugin and replace the following (again, notice the ${argLine}):
<argLine>-Xmx4096m -XX:MaxPermSize=512M ${itCoverageAgent}</argLine>
to
<argLine>${argLine} -Xmx4096m -XX:MaxPermSize=512M ${itCoverageAgent}</argLine>
I faced a bit of a different issue that returned the same error.
Skipping JaCoCo execution due to missing execution data /target/jacoco.exec
The truth is, this error is returned for many, many reasons.
We experimented with the different solutions on Stack Overflow, but found this resource to be best. It tears down the many different potential reasons why Jacoco could be returning the same error.
For us, the solution was to add a prepare-agent to the configuration.
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
I would imagine most users will be experiencing it for different reasons, so take a look at the aforementioned resource!
One can also get "Skipping JaCoCo execution due to missing execution data file" error due to missing tests in project. For example when you fire up new project and have no *Test.java files at all.
There might a case where some other argline setup or plugin in pom may be overriding jacoco execution order setup.
argLine set to -javaagent:/Users/davea/.m2/repository/org/jacoco/org.jacoco.agent/0.6.2.201302030002/org.jacoco.agent-0.6.2.201302030002-runtime.jar=destfile=/Users/davea/Dropbox/workspace/myproject/target/jacoco.exec
One of the example
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.16</version>
<configuration>
<forkCount>5</forkCount>
<reuseForks>true</reuseForks>
<argLine>-Dnet.sf.ehcache.disabled=true</argLine>
</configuration>
</plugin>
After getting rid of argLine from these plugins, jacoco started to work normally.
I know this question is pretty old but if someone like me comes here looking for an answer then this might help. I have been able to overcome the above error with this.
1) Remove the below piece of code from the plugin maven-surefire-plugin
<reuseForks>true</reuseForks>
<argLine>-Xmx2048m</argLine>
2) Add the below goal:
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
I've tried all answers but only the following combination of advice has worked for me. Why? I had very specific requirements:
JaCoCo generates report when build is run from command line: mvn clean verify (Maven 3.6.0)
Intellij IDEA (2019.01) runs my tests as well
It all works in presence of another javaagent defined in surefire plugin
Solution - prepend argLine value in surefire configuration with "late replacement" maven property #{...} as explained in surefire FAQ (my fixed configuration)
How do I use properties set by other plugins in argLine?
Maven does property replacement for
${...}
values in pom.xml before any plugin is run. So Surefire would never see the place-holders in its argLine property.
Since the Version 2.17 using an alternate syntax for these properties,
#{...}
allows late replacement of properties when the plugin is executed, so properties that have been modified by other plugins will be picked up correctly.
Failed first try - define jaCoCoArgLine property in prepare-agent goal configuration of jacoco - the scenario failed my second requirement, IntelliJ IDEA couldn't figure out agent for jmockit I use in the project for static method mocking
When using the maven-surefire-plugin or maven-failsafe-plugin you must not use a forkCount of 0 or set the forkMode to never as this would prevent the execution of the tests with the javaagent set and no coverage would be recorded.
ref: https://www.eclemma.org/jacoco/trunk/doc/maven.html
this is my gist
I was having the same issue. I updated the Jacoco version from 0.6 to 0.8 and updated surefire plugin as well. The following command generated Jacoco reports in site/jacoco/ folder:
mvn clean jacoco:prepare-agent install jacoco:report
My maven configurations are as follows:
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.6</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
<execution>
<id>jacoco-check</id>
<goals>
<goal>check</goal>
</goals>
<configuration>
<rules>
<rule>
<element>PACKAGE</element>
<limits>
<limit>
<counter>LINE</counter>
<value>COVEREDRATIO</value>
<minimum>0.0</minimum>
</limit>
</limits>
</rule>
</rules>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
<configuration>
<forkedProcessExitTimeoutInSeconds>60</forkedProcessExitTimeoutInSeconds>
<forkCount>1</forkCount>
</configuration>
</plugin>
</plugins>
Came accross the same problem just now.
I have a class named HelloWorld, and I created a test class for it named HelloWorldTests, then I got the output Skipping JaCoCo execution due to missing execution data file.
I then tried to change my pom.xml to make it work, but the attempt failed.
Finally, I simply rename HelloWorldTests to HelloWorldTest, and it worked!
So I guess that, by default, jacoco only recognizes test class named like XxxTest, which indicates that it's the test class for Xxx. So simply rename your test classes to this format should work!
FWhat tdrury said:
change your plugin configuration into this:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.6.3.201306030806</version>
<executions>
<!-- prepare agent for measuring integration tests -->
<execution>
<id>prepare-integration-tests</id>
<phase>pre-integration-test</phase>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<destFile>${basedir}/target/coverage-reports/jacoco-unit.exec</destFile>
</configuration>
</execution>
<execution>
<id>jacoco-site</id>
<phase>post-integration-test</phase>
<goals>
<goal>report</goal>
</goals>
<configuration>
<dataFile>${basedir}/target/coverage-reports/jacoco-unit.exec</dataFile>
</configuration>
</execution>
</executions>
</plugin>
Edit:
Just noticed one important thing, destFile and dataFile seems case sensitive so it's supposed to be destFile, not destfile.
I struggled for days. I tried all the different configurations suggested in this thread. None of them works. Finally, I find only the important configuration is the prepare-agent goal. But you have to put it in the right phase. I saw so many examples put it in the "pre-integration-test", that's a misleading, as it will only be executed after unit test. So the unit test won't be instrumented.
The right config should just use the default phase, (don't specify the phase explicitly). And usually, you don't need to mass around maven-surefire-plugin.
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.4</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-site</id>
<phase>post-integration-test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
Try to use:
mvn jacoco:report -debug
to see the details about your reporting process.
I configured my jacoco like this:
<configuration>
<dataFile>~/jacoco.exec</dataFile>
<outputDirectory>~/jacoco</outputDirectory>
</configuration>
Then mvn jacoco:report -debug shows it using the default configuration, which means jacoco.exec is not in ~/jacoco.exec. The error says missing execution data file.
So just use the default configuration:
<execution>
<id>default-report</id>
<goals>
</goals>
<configuration>
<dataFile>${project.build.directory}/jacoco.exec</dataFile>
<outputDirectory>${project.reporting.outputDirectory}/jacoco</outputDirectory>
</configuration>
</execution>
And everything works fine.
I know this is late, but just for anyone else who has this issue and nothing seems to fix it (like I had). Make sure that in you pom, your configuration for jacoco inside plugins is not in turn inside pluginManagement. It seems some sort of default for maven is to put the plugins inside pluginManagement. This is almost unnoticeable until you try to add detailed configurations like for jacoco. In order to add these, you need to add them outside of the pluginManagement, otherwise they are effectively ignored. See my poms below for details.
My old pom (that gave the "Skipping jacoco ..." message):
<project>
...
<build>
<pluginManagement>
<plugins>
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.2</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
My new pom (that now compiles a working jacoco report):
<project>
...
<build>
<pluginManagement>
<plugins>
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.2</version>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
It happens if the path of your project has blank spaces anywhere, such as:
/home/user/my projects/awesome project
the report is not generated. If that is the case, remove those spaces from directory names, such as:
/home/user/my-projects/awesome-project
or move the project to a directory that doesn't have spaces along the way.
About the plugin configuration, I just needed the basic as below:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.5</version>
<executions>
<execution>
<id>jacoco-initialize</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-report</id>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
Jacoco Execution data file is a jacoco.exec file which is generated when prepare agent goal is running. When It isn't generated or the correct path isn't set in configuration, you will get that error message. Because Jacoco use It to build test coverage. This usually occur when you use jacoco maven plugin and surfire or failsafe. To ensure that the jacoco.exec file is generated, you have to add argline in you pom.xml file, not in the surfire configuration but inside a properties tag in you pom.xml file.
<properties>
<argLine>-Xmx2048m</argLine>
</properties>
The execution says it's putting the jacoco data in /Users/davea/Dropbox/workspace/myproject/target/jacoco.exec but your maven configuration is looking for the data in ${basedir}/target/coverage-reports/jacoco-unit.exec.
I have added a Maven/Java project with 1 Domain class with the following features:
Unit or Integration testing with the plugins Surefire and Failsafe.
Findbugs.
Test coverage via Jacoco.
Where are the Jacoco results? After testing and running 'mvn clean', you can find the results in 'target/site/jacoco/index.html'. Open this file in the browser.
Enjoy!
I tried to keep the project as simple as possible. The project puts many suggestions from these posts together in an example project. Thank you, contributors!
My response is very late but for others users
In your case you have to configure failsafe pluging to use the command line agent configuration saved in itCoverageAgent variable.
For exemple
<configuration>
<argLine>${itCoverageAgent}</argLine>
</configuration>
In your maven configuration, jacoco prepare the command line arguments in prepare-agent phase, but failsafe plugin doesn't use it so there is no execution data file.
Sometimes the execution runs first time, and when we do maven clean install it doesn't generate after that.
The issue was using true for skipMain and skip properties
under maven-compiler-plugin of the main pom File.
Remove them if they were introduced as a part of any issue or suggestion.
In my case, the prepare agent had a different destFile in configuration, but accordingly the report had to be configured with a dataFile, but this configuration was missing. Once the dataFile was added, it started working fine.
I faced similar error because tests execution were skipped.
I ran my build with similar system parameter : -Dmaven.test.skip.exec=true
Turning this system parameter to false solved the issue.
I just removed following two lines from properties tag
<jacoco.ut.reportPath>${project.basedir}/../target/jacoco.exec</jacoco.ut.reportPath>
<sonar.jacoco.reportPaths>${project.basedir}/target/jacoco.exec</sonar.jacoco.reportPaths>
mvn install -Psonar by default creates jacoco.exec in target directory, so explicit path was not needed in my case.
For others that met similar problem, here is another possible solution:
Our project was running in a Traditional Chinese version of Windows, and when we checked prepare-agent section in maven log, we found that it tried to read the project folder which we put on desktop, through \桌面\...\project\... instead of \Desktop\...\project\.... I think UTF-8 symbol in paths make Jacoco go weird. We moved the project into other place and the issue was fixed.
TL;DR:
Check prepare-agent logs too as jacoco.exec was prepared during that.
2 Other Possibilities
JaCoCo's Maven plugin could be better integrated with Maven to provide more information about it's invocation and incorrect invocations. Nonetheless.
Possibility #1: Custom Arguments In Surefire plugin
Using JPMS module for my project with standard Maven directory layout, basic JSE 11 program, JUnit 5 & JaCoCo, with Eclipse and single module-info.java file (Eclipse 4.13 won't allow 2 module-info.java files in the project's root of the classpath). In order for Surefire to see my test cases I had to use the single <argLine> tag to allow Surefire to gain access using: --add-opens for all of the packages having unit tests:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
<configuration>
<argLine>
#{argLine}
--add-opens module_name/com.myco.project=ALL-UNNAMED
--add-opens module_name/com.myco.project.more=ALL-UNNAMED
--add-opens module_name/com.myco.project.others=ALL-UNNAMED
</argline>
</configuration>
...
</plugin>
According to Jacoco documentation, you have to directly pass the Jacoco arguments to Surefire since specifying any Surefire arguments using <argLine> overrides Jacoco's defaults. Jacoco's online Maven documentation specifies using #{argLine} to pass Jacoco's arguments to Surefire (https://www.jacoco.org/jacoco/trunk/doc/prepare-agent-mojo.html).
Possibility #2: Intermingling Plugins
I also use the maven-javadoc plugin in my <reporting/> section. Incidentally, during the Javadoc reporting phase, it manages to invoke the prepare-agent goal of JaCoCo and gives the OP's error message shortly thereafter (according to maven debug, specifically while the maven-project-info-reports-plugin is configuring the reports to begin generating for maven site) - this despite the fact that my Test phase has already run and dumped a proper jacoco.exec file in the build output directory. It may be safe to ignore this warning, my JaCoCo report renders fine in my Maven Site. However, if you're seeing it during the execution of a JaCoCo goal, it probably shouldn't be ignored.
Tips
If you're having doubts about the file getting created, watch the directory where the file is supposed to appear during the build. Generating the file is a fairly slow process. See my other answer here: https://stackoverflow.com/a/75465187/2336934
Do your best to keep to all the defaults as much as possible, simpler is better.
I have a kotlin project using Java 8 and I use Sonar to measure code coverage
I am using the latest version of Sonar and noticed the coverage has gone down due to changes in the openjdk. My tests are using Mockito and PowerMockito. Some tests are failing due to reflection errors.
When I add the following jvm args - the errors go away - --add-opens java.base/jdk.internal.loader=ALL-UNNAMED
However, if I add the maven-surefire-plugin to my pom.xml - the code coverage shows as 0 in Sonar
I use Jacoco to measure the coverage - here is the relevant section of my pom.xml
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco-maven-plugin.version}</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
<!--https://stackoverflow.com/questions/39750348/how-to-add-vm-args-using-pom-xml-plugin/39751176 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.20</version>
<configuration>
<argLine>--add-opens java.base/jdk.internal.loader=ALL-UNNAMED</argLine>
</configuration>
</plugin>
So if I dont include the surefire plugin, my sonar code coverage shows up but some tests fail due to the above mentioned error.
If I include the surefire plugin, all my tests pass but my code coverage shows as 0 in sonar
I am using the following command to run my tests and analyze with Sonar
mvn clean install -DskipTests=false -Dmaven.test.failure.ignore=true sonar:sonar
Is there anyway the surefire plugin and jacoco plugin can co exist so as to see coverage in sonar or can folks provide any further recommendations?
Typically, the jacoco and surefire plugins have to be "integrated" properly, so that unit tests are run with the jacoco agent. I'm surprised that you get coverage if you don't specify a surefire plugin. I imagine there must be defaults that make that happen. In my view, it's best to be explicit, so it's clear they are integrated.
You should probably have the following in your jacoco plugin:
<execution>
<id>pre-unit-test</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<propertyName>surefireArgLine</propertyName>
</configuration>
</execution>
And the following in surefire:
<argLine>${surefireArgLine}</argLine>
If you really need those additional parameters, just add it to the end of this value.
I'm converting a largish Ant build to Maven. As part of the Ant build, we have several steps which created Java classes by invoking one of the project's classes, simplified as:
javac SomeGenerator.java
java SomeGenerator generated # generate classes in generated/
javac generated/*.java
I've split each generator in its own Maven module, but I have the problem of not being able to run the generator since it's not yet compiled in the generate-sources phase.
I've tried something similar to
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1.1</version>
<executions>
<execution>
<id>generate-model</id>
<goals>
<goal>java</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<mainClass>DTOGenerator</mainClass>
<arguments>
<argument>${model.generated.dir}</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
Which sadly does not work, for the reasons outlined above. Splitting the code generators into two projects each, one for compiling the generator and another for generating the DTOs seems overkill.
What alternatives are there?
Using Maven 2.2.1.
You can execute the maven-compile-plugin in the generate-sources phase. Just add another execution before the existing execution and configure it so that it just picks up the sources for the generator.
Or split the project in two: build the generator with a separate POM and include the generator library as a dependency to the POM that's generating the sources.
Personally I would split the project. Keeps the build files cleaner and easier to maintain.
I didn't want to have 2 different projects, so I tried to setup Maven for adding the generated compiled code to the final jar package.
This is the working solution I've used:
In process-classes phase (executed just after the compile phase):
exec-maven-plugin for executing a main class able to generate my source files in target/generated-sources/java folder (in my specific case I used the Roaster library for source code generation);
build-helper-maven-plugin for adding the generated sources in the correct location
In prepare-package phase:
maven-compiler-plugin, in order to detect the changes and recompile the module
maven-jar-plugin for producing the jar package
This is my pom.xml:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<executions>
<execution>
<phase>process-classes</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>com.example.MyClassWriter</mainClass>
<arguments>
<argument>${project.basedir}</argument>
<argument>${project.build.directory}</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<phase>process-classes</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated-sources/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<executions>
<execution>
<phase>prepare-package</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
In order to do this in one project, there are 3 steps:
Compile generator code
We can do it in generate-sources phase, using maven-compiler-plugin. You can also exclude other source files.
Run generator to generate code
We can do it in process-sources phase, using exec-maven-plugin.
Compile project
Below is the key part of pom.xml
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
<executions>
<execution>
<id>compile-generator</id>
<phase>generate-sources</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<includes>
<include>source/file/of/generator/*.java</include>
</includes>
<excludes>
<exclude>other/source/files/*.java</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<executions>
<execution>
<id>generate-codes</id>
<goals>
<goal>java</goal>
</goals>
<phase>process-sources</phase>
<configuration>
<mainClass>your.main.class.of.generator</mainClass>
</configuration>
</execution>
</executions>
</plugin>
We faced the same problem. We wanted to respect Maven's behavior as closely as possible, to have no problems with plugins and so on... Fighting Maven is just too expensive!
We realized that the update frequency of the generated code was usually very different from the one of the code that we manually write, so separating the code had very good performance characteristics for the build. So we accepted to have our generated classes as a dependency of the manually written.
We adopted the following structure, that had just one little change from a regular maven config, a change in the source directory.
Parent project : Generations
We created a parent project for all our generations.
It has a JAR type if it contains code to be compiled, otherwise POM.
There we have our generating code, in /src.
It can compile in /target as usual.
It runs the generation, each generator producing code in a sub-directory of /target.
Note: if you want several generated results in the same jar, just put them in the same sub-directory.
Child jar projects : Generateds
It is a subdirectory of the Generations project.
It has a JAR type.
The source directory points to the sub-directory in the parent's target.
<sourceDirectory>../target/generated1</sourceDirectory>
It compiles normally in its own /target directory.
That structure allows us to :
have as little modification to the standard maven layout as possible, so every maven command and plugin keeps working nicely.
scale nicely if you have several generators,
scale nicely if you want to generate several jars (we had a case wsdl2java where one generator produced code that should be split into several jars ; each child generated project would have the same source directory, but would be configured with an <includes> to handle only some of the classes).
I posted a minimal working setup here https://github.com/baloise/inlinesourcecodegenerator
It uses build-helper compiler and exec plugins and has all code in the same project.